I have a 720 4x4 < manufacture date 4/84 > this is my good truck with a bad Z-24 engine. I also have a 720 4x4 < manufacture date 7/85 > parts truck this one has a Z-24i. I have swapped the engines transfered intake, webber carb. my Q. is. Is it possible to swap the timing setup from the early model to the late model engine? The trany provided a great source for gears.